The TX_CNTL line is connected to the PDN line of a Linx transmitter so that
the module will enter a low power state when not in use. A LED can also be
connected to the TX_CNTL line to provide visual indication that the encoder
is sending data.
In this example, the data lines are pulled high by simple pushbutton
switches, but many other methods may be employed. Trace contacts,
reed switches or microcontrollers are just some examples of other ways of
pulling the data lines high. The flexibility of the encoder combined with the
associative options of the matching decoder opens a whole new world of
options for creative designers.
System Example
The first step in using the encoder is to set the baud rate using the SPDT
switches. Next, a unique Code Word is created by pressing and holding the
button connected to the CREATE_ADDR line for as long as desired. While
the button is held, the LED will be on indicating that the Code Word is
being created. Once the button is released, the LED will start flashing. The
data buttons that the encoder is to access are now pressed. Pressing the
CREATE_ADDR button again makes the encoder save the new Code Word
and Control Permissions, turn off the LED, and go to sleep.
The decoder must now learn the Code Word for the system to be
operational. Please see the decoder design guide for instructions on
how to do this. The MS Series Master Development System implements
this system, so please see the User’s Guide for the kit for more system
information and circuit schematics.
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